Ring Spun Cotton:A cotton yarn with good durability and hand (feel); however, it is not combed to remove the shorter fibers.

Stretch Nylon:Continuous nylon filaments that are crimped and heat set to provide elasticity. Due to the relatively high level of elasticity imparted to nylon after it is crimped and heat set, it is very commonly utilized to make stretch socks in combination with other yarns.

Elastic (rubber):A rubber or spandex (synthetic elastic) that provides extreme stretch and recovery. It is usually wrapped with a man-made filament yarn in order to provide consistency in its stretch and recovery.